Improvement in relief and safety stop valves



C. P. WIGGINS.'

RELIEF AND SMAET'Y'4S'IQP VALVE.- No.188,556. Patented March 20,1877.

MOWM

Aonms.

STATES PATENT Frou.

CHARLES P. WIGGINS, OF ST. LOUIS, MISSOURI.

IMPROVEMENT IN RELIEF AND SAFETY STOP VALVES.

Specification forming part of Letters Patent No. 188,556, dated March 20, 1877; application tiled January 19, 1877.

To all whom t may concern:

Beit known that I, CHARLES PYLE Wre- GINS, of'St. Louis, in the county of St.vLouis and Stateof Missouri, have invented a new and useful Improvement in Relief or Safety Stop Valve, of which the following is a specication:

The figure is a longitudinal4 section of my improved valve.

The object of this invention is to furnish an improved stop-valve, to preventaccidents from carelessly closing thevfeed-pipe while the I ,pump is in motion, and which shall be so constructed as to always leave an open discharge.

The invention consists in a relief or safety stop valve, formed of the shell provided With an inlet, two outlets, and two valve-seats, and the double valve, so arranged that it can close only one outlet at a time, to adapt it to be interposed between the boiler and the check-valve of the pump discharge-pipe, as hereinafter fully described.

A represents the shell of my improved valve. al is the opening that leads to the check-valve, and thence to the pump. a2 is the opening that leads to the boiler, andi/L3 is an opening that leads to the open air, or to any convenient receiver. rlhe shellA is provided With two valve-seats, a4a5, one upon each side of the opening al. B is a double valve, which may be adjusted to rest upon the seat a4 and close the passage to theboiler, or may be adjusted to rest upon theseat als and close the discharge a3, but which can never close both openings at' the same time, thus leavinga free discharge for the water at all times. In

the shell A, above the seat a5, is formed af chamber, a6, through which the water passes to the dischargeopening a3.

The valve B is attached to the end of a stem,

C, which has a screw-thread cut upon it, and

passes in through a screw-hole in the end of the shell A, and through a stuffing-box, D, at-

tached to said end, so that the valve B may be adjusted into either seat by turning the stem C. To the outer end of the stem C is at- -tached va hand-wheel, E, for convenience in turning it. v

By this device, should the discharge of Water into the boiler be stopped while the pump is at Work, the Water will be discharged through the passage a3, and there will be no 

